25854109 has 4 divisors (see below), whose sum is σ = 26745660. Its totient is φ = 24962560.

The previous prime is 25854097. The next prime is 25854119. The reversal of 25854109 is 90145852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20448484 + 5405625 = 4522^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 25854109 - 2⁵ = 25854077 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25854119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445732 + ... + 445789.

It is an arithmetic number, because the mean of its divisors is an integer number (6686415).

Almost surely, 2^25854109 is an apocalyptic number.

25854109 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

25854109 is a deficient number, since it is larger than the sum of its proper divisors (891551).

25854109 is an equidigital number, since it uses as much as digits as its factorization.

25854109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891550.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 25854109 is about 5084.6935994217. The cubic root of 25854109 is about 295.6944626971.

The spelling of 25854109 in words is "twenty-five million, eight hundred fifty-four thousand, one hundred nine".